Insulating material and method of making



Patented Apr. 7, 1936 UNITED STATES PATENT OFFIE INSULATING MATERIAL AND METHOD OF MAKING Johannes Leppik, Nomme, Tallinn, Estonia, as-

signor to Telsit Insulation Corporation, New York, N. Y., a corporation of Delaware No Drawing. Application August 15, 1932, Serial No. 628,897. In Estonia August 17, 1931 2 Claims. (Cl. 106-18) The present invention relates to a heat nonbe very successfully used in insulating pipes, conducting material, to be used for the insulasteam superheaters and the like, heated up to a tion of boilers, engines, steam pipes, refrigertemperature of 250 C. In case the partitions to ating installations and the like. A great numbe insulated are subjected to temperatures ex- 5 ber of materials of this kind have already been ceeding 250 C., it is recommended first to cover recommended, but none of them come up to rethem with a comparatively thin layer of a mixquirements. Such materials which actually posture consisting of one part of asbestos and five sess high insulating qualities are exceedingly eX- parts of magnesiaand thereupon with a layer of pensive, while those more or less accessible with the insulating material prepared to Formula II.

regard to price, are heavy, combustible, insui- To obtain an absolutely non-hygroscopic in- 10 ficiently plastic, inelastic and not durable. sulating material, the following formula is The proposed insulating material is very light, recommended:-

plastic as well as elastic, incombustible, scentless, and possesses sufficient durability as well as considerable viscosity, besides being very Formula III Voluminal parts cheap. Below are given three formulae for the figgg 3 insulating substance, which it is recommended Cement t035 to use in dependence of the way of insulation to be applied and the temperature of the parti- Water to brmg about gruel like mass tions, if any, to be insulated: This coating is especially fit for covering of 20 pipes located under ground or in the open air re- Formula I frigerating installations and the like as well as a Volummal parts Plastic fatty clay 0 s to 1 3 for msulaeen- Mined paper to Iiavmg now particularly described and ascer- Sawdust toao tamed the nature of my said invention, and in 25 Bast fibreg to what manner the same 1s to be performed, I declare that what I claim is: As to best fibres there may be applied flax ref- 1. A material of the following composition and use, hemp straw, hemp waste, jute waste and ratio by volume:

the like. The mixture obtained is to be well Voluminal parts 30 kneaded by adding Water until it forms a kind of Plastic fatty clay 0.8 to 1.3 gruel. The insulating material prepared accord- Milled paper 1.2 to 2.2 ing to the above formula is especially recom- Sawdust 4.5 to 8.0 mended in cases where the temperature of the Bast fibres 1.5 to 2.5

partitions to be insulated does not exceed 150 C. 2' A material of the following composition and 35 Formula II ratio by volume:

Voluminal parts Voluminal parts Plastic fatty clay 0,8 to 1,3 Plastic fatty clay 0.8 to 1.3

Asbestos 1,5 to 2,5 Asbestos 1.5 to 2.5 40 Milled paper 1,2 to 2,2 Milled paper 1.2 to 2.2 Saw-dust 4,5 to 8,0 Sawdust 4.5 to 8.0 Bast fibres 1,5 to 2,5 Bast fibres 1.5 to 2.5 Water to be added to obtain a gruel-like sub- Water to be added to Obtam gruel'hke substance stance 45 The material prepared from this formula can JOHANNES LEPP 

